I just finished watching a leap for Lisa. Throughout the entire show they refer to Ziggy as a he. Sam even refers to her as a he in the leap back. At the beginning of a leap for Lisa Sam calls Ziggy a he, but then at the end he says she.

Could Sam have possibly changed something because of his actions in a leap for Lisa?

Or is it possible that Ziggy being a computer is technically genderless and they can refer to "it" as either or.

Is there any explanation given further in the series? I just finished season 4.